The occupation, work, or trade in which a person is engaged.
A specific occupation or pursuit.
Commercial, industrial, or professional dealings.
A commercial enterprise or establishment.
Volume or amount of commercial trade.
Commercial dealings; patronage.
One's rightful or proper concern or interest.
Something involving one personally.
Serious work or endeavour.
An affair or matter.

Brought to the attention of the general public by Axl Rose's famous pose in front of a car with "bidnesz" on license plate.